visual web deveoper db's|HELP PLEASE

[bob42]

I am using visual web developer 2005. When I create an application with a database it runs fine on my machine but when I upload it and the db files to the server and put the mdf files in the app_data directory it will not run. It cannot find the db's
THANK YOU

[leroys1000]

Is there a data base server running on the server.
The database files can't on thier own,they have to be
connected to a database engine.